Allendale Weather Forecast

    • 47
    • 59

    Rain Showers Likely

    • 45
    • 70

    Mostly Sunny

    • 50
    • 77

    Partly Sunny

    • 52
    • 78

    Partly Sunny

    • 49
    • 79

    Mostly Sunny

    • 50
    • 75

    Mostly Sunny

Today 17 Sep Natrona County Lower Elevations

Showers likely. A slight chance of Thunderstorms this afternoon. Highs in the lower 60s. Northwest Winds 10 to 15 Mph. Chance of rain 60 percent.

Tonight 17 Sep Natrona County Lower Elevations

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows in the mid 40s. North Winds around 10 Mph with Gusts up to 20 Mph in the evening. Chance of rain 30 percent.

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Allendale Temperature Statistics

September Temperature

Casper, Natrona County International Airport (9.9 miles)

  • Lowest 6 September, 2025

    37.9 °F

  • Average September

    65.8 °F

  • Highest 10 September, 2025

    90 °F

Climate (2020–Present)

Casper, Natrona County International Airport (9.9 miles)

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  • Average Low 2020–2025

    32.6 °F

  • Average 2020–2025

    46.7 °F

  • Average High 2020–2025

    60.3 °F
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